Daniel m



(NoModeL) I v D. M. KNOWLES.

Door Frame for Stoves and Furnaces.-

No. 243,581. Patented June 28,1881.

l HIHHHHW UNITED STATES PATENT OFFHJE.

DANIEL M. KNOWLES, NEW BEDFORD, MASSACHUSETTS, ASSIGNOR TO HIMSELF AND HORATIO G. DEAN, OF SAME PLACE.

DOOR-FRAME FOR sTove AND FURNACES.

SPECIFICATION forming part of Letters Patent No. 243,581, dated June 28, 1881. Application filed March 29, 1881. (No model.)

To all whom it may concern:

Be it known that I, DANIEL M. KNowLEs, of New Bedford, in the county of Bristol and State of Massachusetts, have invented certain new and useful Improvements in Door-Frames and Necks for Stoves and Furnaces; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon ,which form part of this specification.

This invention relates to certain improvements in that class of door-frames and necks for sheet-iron stoves which are constructed in 1 two parts, one adapted to set against the inside and the other against the outside of the stove, and clamp the walls between, so as to be held in place without weakening the walls of the stove with rivets for securing the frames.

While the rivets heretofore employed for securing the ordinary frames are rendered unnecessary, it has been found that the metal of the stove is apt to part at the outer edges of the flanges which clamp it during the ordinary handling of the stove in putting it up, taking it down, and moving it from place to place. The object of my invention is to obviate this objection and render the pipe stronger at the joint of the frame or neck than heretofore and this I accomplish by making the flange of the outer frame considerably larger than that of the inner frame, so as to extend the metal of the outer flange beyond the edge of the inner flange, form a secure seat against the outside 3 5 of the stove, and at the same time permit the walls of the stove to yield under any sudden pressure or blow upon the frame to a sufficient extent to prevent any breakage and spring the frame back to its normal position afterward,

as more fully hereinafter specified.

In the drawings, Figure 1 represents a front view of a door-frame Fig. 2, a central section of the same, and Fig. 3 a section of a pipe-collar.

5 In the drawings, the letter A indicates the door-frame or pipe-collar of a stove or furnace, of suitable size and shape to fit the intended opening in the stove orfurnace. The said door frame or collar is provided with flange B at its base, which sits against the outer wall of the stove or furnace when said collar is in place.

The letter 0 indicates a frame adapted to fit within the door-frame or pipe-collar, the said frame corresponding in general configuration to the configuration of the door-frame or 001- 5 lar. The said frame 0 is provided with flange D, which sits against the inner wall of the stove or furnace when in place.

The flange B is made considerable larger than the flange D, so as to overlap it and protect the shell of the stove at the outer edge of flange D, and to some extent beyond it, as indicated in the drawings, and prevent breakage in the event of side pressure or sudden blows against the outside of the frame or door.

The door-frame or collar is provided with apertures E, and the inner frame, 0, with similar apertures, whereby the two may be secured together by means of suitable bolts.

In applying my improved frame or collar the said door-frame or collar, as the case may be, is applied over the opening in the stove or furnace, on the outside, with the flange resting against the outer. Wall. The inner frame is then inserted'in the opening from the inside, and into the door-frame or collar, and the two are securely fastened together by means of the bolts, clamping the edges of the opening between the flanges, and firmly fastening the door-frame or collar in place.

- Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

The combination, with the walls of a stove, of the inner and outer frames and their clamping devices, the said frames being flanged at their bases, the flange on the outer frame extending beyond the flange on the inner so as to .overlap it, substantially as and for the purposes specified. 4 a

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses.

DANIEL M. KNOWLES.

Witnesses:

J. O. KNowLEs, WM. W. HATHAWAY. 

